Tea bag and method for manufacturing the same

ABSTRACT

There are provided a tea bag that can be easily taken out of a plastic bottle and excels in mass productivity, and a method for manufacturing the same. As for tea bag  1,  a bag body  2  storing tea leaves  3  therein is put into the plastic bottle to brew tea essence from the tea leaves. The bag body  2  includes a first lateral surface and a second lateral surface formed of sheet members having water permeability. As for the first and the second lateral surfaces, a trapezoidal upper portion  21  tapered toward a distal direction thereof and a rectangular lower portion  22  are integrally formed to form the bag body  2  in a truncated home base shape.

TECHNICAL FIELD

The present invention relates to a tea bag that can be directly put into a plastic bottle containing water or hot water therein as tea beverage material liquid or put into an empty plastic bottle before tea beverage material liquid is put into the plastic bottle, to shake the plastic bottle so as to brew tea essence, from tea extracts to make tea beverage, and relates to a method for manufacturing the same.

BACKGROUND ART

As for a conventional tea bag to be put into a plastic bottle and used a tea bag as disclosed in Patent Document 1 devised by the present inventor is known. In a green tea bag for a small plastic bottle of 500 ml or less as disclosed in Patent Document 1, tea leaves are enclosed in an interior of a longitudinally rectangular bag body. Top right and left edges of the bag body are overlapped and a rectangular triangular portion in the overlapped region is sealed, while a portion that is neither overlapped nor sealed is a hollow allowing water to pass through easily.

As for the tea bag as disclosed in Patent Document 1, even with the small plastic bottle of 500 ml with a small opening, when the plastic bottle is inverted after drinking out green tea beverage, the rectangular triangular sealed portion at a top of the bag body is folded to collect the tea leaves at a distal end portion where the right and left edges are overlapped so that the bag body is in a deformed conical shape to be smoothly taken out of the bottle.

Further, conventional tea bags that are not to be put into a plastic bottle as disclosed in Patent Documents 2 and 3 are known.

As for the tea bag for drinking as disclosed in Patent Document 2, a central portion of a bag body is folded to bind an upper end thereof with a stapler. Moreover, as for a bag for brewing as disclosed in Patent Document 3, two vertices of a triangular pyramid of a regular tetrahedral bag body in which tea leaves are stored are overlapped to each other and a hanging string is provided on a top of the bag body.

PRIOR ART DOCUMENTS Patent Documents

Patent Document. 1: Japanese Patent No, 4380955

Patent Document 2: Japanese Examined Utility Model Publication No. S35-28962

Patent Document 3: Japanese Utility Model Application Publication No. H04-097072

SUMMARY OF THE INVENTION Problems to be Solved by the Invention

The green tea bag for a small plastic bottle of 500 ml or less as disclosed in Patent Document 1 can be easily taken out of the plastic bottle when the plastic bottle is inverted. Accordingly, the plastic bottle can be recycled and a thickness of the tea beverage can be adapted for preferences by adjusting the timing for taking out the tea bag so as to adjust a degree of brewing. Although a proximal end forming the bag body is formed in a rectangular shape to be in as planar shape, however, a distal end of the bag body is adhered by sealing the overlapped top right and left edges of the hag body so as to be easily taken out of the plastic bottle. Accordingly, the distal end of the bag body is in a stereoscopic shape, and thus a sealing operation in a manufacturing process is laborious.

As for the bag body for drinking as disclosed in Patent Document 2, since top right and left edges are overlapped to be bound by a stapler, a top portion is firmly stapled by a staple. Accordingly, even if an opening is oriented downward to take out the tea bag, tea leaves are prevented from moving toward the distal end of the bag body by the staple for stapling the bag body to enclose the tea leaves. Accordingly, the bag body bulges to be in a trapezoidal shape with the staple as a bottom, and thus it is not easy to take out the tea hag through a narrowed opening of the plastic bottle.

As for the bag for brewing as disclosed in Patent Document 3, when the plastic bottle is inverted, tea leaves are collected at two triangular portions overlapped to each other, respectively. Accordingly, a top portion of the tea bag deforms to have a thick triangular shape, and thus it is not easy to take out the tea bag through the narrowed opening of the plastic bottle.

Therefore, an object of the present invention is to provide a tea bag that can be easily taken out of a plastic bottle with an excellent mass productivity and a method for manufacturing the same.

Solutions to the Problems

The present invention provides a tea bag with a bag body storing tea extracts therein to be put into a plastic bottle to brew tea essence from the tea extracts, wherein the bag body includes a first lateral surface and a second lateral surface formed by a sheet member with water permeability, narrow width portions tapered toward a distal direction of the first and the second lateral surfaces are formed on the first and the second lateral surfaces respectively, and at least oblique side edges of the narrow width portions are adhered to each other to close the bag body.

In the tea bag of the present invention, the bag body storing the tea extracts is configured by two surfaces, namely the first lateral surface and the second lateral surface. On the first lateral surface and the second lateral surface, narrow width portions tapered toward a distal direction are formed respectively. Accordingly, after the tea bag of the present invention is put into a plastic bottle and tea essence is brewed from tea extracts, as the plastic bottle is inverted to take out the tea bag, the tea extracts move toward the distal end so that the distal end is in substantially a conical shape similar to that of a distal tip of a pencil. The distal end in substantially a conical shape slightly protrudes out of an opening of the plastic bottle so as to be pinched by a user even if the opening of the plastic bottle has a small diameter. Accordingly, if the distal end is pulled out., the tea bag can be smoothly taken out of the plastic bottle even if the tea bag slides along an inner peripheral surface of the opening. Regarding the bag body, oblique side edges of the narrow width portions are adhered to each other achieving a planar adhesion. Accordingly, the first lateral surface and the second lateral surface can be easily adhered to each other to close the bag body.

It is desirable that the hag body may be formed in substantially a triangular shape with its top head portion truncated or substantially a home base shape. Since the top head portion of the bag body is truncated, a connecting part between the top head portion and an oblique side of the narrow width portion is reinforced so as to rigidly form the distal end of the bag body. Accordingly, the distal end of the bag body can be prevented from being bent to be hard to exit the bottle.

Further, the present invention provides a method for manufacturing a tea bag including a bag body storing tea extracts therein to be put into a plastic bottle to brew tea essence from the tea extracts, the method including the steps of matching two broad sheet members having water permeability with each other; commonly using oblique sides of narrow width portions tapered toward a distal direction of the narrow width portions by the adjacent bag bodies, the oblique, sides being profiles of the bag bodies, and fixing the profiles arranged such that distal ends thereof face with each other alternately as an adhesion line to be a position to adhere the two sheet members; and cutting the adhesion line to form the individual bag bodies.

According to the method for manufacturing the tea bag of the present invention, when the oblique sides of the narrow width portions tapered toward a distal direction of the narrow width portions as the profiles of the bag bodies are commonly used with the adjacent bag bodies and the distal ends are arranged such that they face with each other alternately, the bag bodies can be formed from the two broad sheet members without gaps. Accordingly, the bag bodies that are easily taken out of the plastic bottle can be manufactured from the sheet members without wastes.

It is desirable that the two sheet members are longitudinal sheet members with a width corresponding to a height of the bag body when the sheet members are overlapped with each other, the sheet members are filled with the tea extracts from the other oblique side in the open state after fixing the position to be the oblique sides of the narrow width portions as the adhesion line, the position to be the other oblique side is fixed to close the sheet members as the bag body, and the position to he the other oblique side is cut as the cutting line to separate the bag body from the sheet members. As described above, the tea bag of the present invention can be manufactured by cutting and separating the bag body from the two longitudinal sheet members while filling them with the tea extracts sequentially.

Effects of the Invention

In the present invention, the oblique side edges of the narrow width portions are adhered to each other to close the bag body so as to achieve a planar adhesion. Accordingly, the first lateral surface and the second lateral surface can be easily adhered to each other to close the bag body. Accordingly, the tea bag can be easily taken out of the plastic bottle and excels in mass productivity.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a view showing a tea hag according to an embodiment 1 of the present invention.

FIG. 2 is a view of an example showing a developed state of a bag body of the tea bag shown in FIG. 1.

FIG. 3 is a view of another example showing a developed state of the bag body of the tea hag shown in FIG. 1.

FIGS. 4(A) and 4(B) are views showing respective steps of a method for manufacturing the tea bag shown in FIG. 1.

FIG. 5 is a view showing as usage state of the tea bag shown in FIG. 1 in which FIG. 5(A) is a perspective view showing a state where the tea bag is put into, and FIG. 5(B) is a perspective view showing a state were the tea bag is taken out.

FIG. 6 is a view showing a tea bag according to an embodiment 2 of the present invention.

FIG. 7 is a view for illustrating a method for manufacturing the tea bag shown in FIG. 6.

FIGS. 8(A) to 8(F) are views illustrating respective steps of another method for manufacturing the tea bag shown in FIG. 6.

FIGS. 9(A) to 9(C) show views illustrating a method for brewing tea essence of the tea bag shown in FIG. 6.

DESCRIPTION OF REFERENCE SIGNS

1, 10: Tea bag

2, 20: Bag body

2 a: Storage part.

2 b: Narrow width portion

2 c: Top head portion

2 d: Top edge side

2 e: Bottom edge side

2 f: Lateral side

2 g: Oblique side

S11, S21: First lateral surface

S19, S22: Second lateral surface

3: Tea leaves

4: Sheet member

41: Side edge

42: Lower edge side

B: Plastic bottle

B1: Opening

S: Sheet member

H: Height

Embodiments of the Invention Embodiment 1

A tea bag according to an embodiment 1 of the present invention will be described with reference to the drawings. A tea bag 1 shown in FIG. 1 is used as being put into a plastic bottle with tea beverage material liquid to brew tea essence from tea extracts. The tea bag 1 according to the present embodiment 1 is put into a plastic bottle with a content of 500 ml. in the embodiment 1, water such as cool water, hot water, and the like is used as tea beverage material liquid that is liquid for brewing the tea essence. As for the tea extracts from which the tea essence is brewed, tea leaves made with cold water, that are steamed deeply and sterilized by heat are used. As for the tea beverage material liquid, drinkable liquid such as water solution to which flavors including sweet taste, sour taste, and the like and spicy taste are added or water solution including nutrient can be used other than the water. Further, as for the tea extracts, roasted cereals can be used other than the tea leaves.

The tea bag 1 includes a bag body 2 formed of a sheet member having water permeability and tea leaves 3 accommodated in a storage part 2 a of the bag body 2.

As shown in FIG. 1, the bag body 2 is formed with a narrow width, portion 2 b tapered toward a distal end thereof and is formed in substantially a truncated triangular shape with a top had portion 2 c. More specifically, a trapezoidal upper portion 21 and a rectangular lower portion 22 are integrally formed to form the bag body 2 in substantially a home base shape like a truncated home base used in baseball. An upper edge side 2 d that can be obtained by being truncated is sized to correspond to a diameter of an opening of the plastic bottle. It is desirable that a height H of the hag body 2 is sized to be greater than a diameter of a trunk portion of the plastic bottle into which the bag body 2 is put.

As shown in FIG. 2, the bag body 2 is adhered such that a first lateral surface S11 and a second lateral surface S12 shaped to have the same profile are overlapped and inner peripheral portions thereof are welded to each other by heat. Further, as shown in FIG. 3, the bag body 2 can be formed such that the first lateral surface S11 and the second lateral surface S12 are positioned vertically with a bottom edge side 2 e as a conjunction side to be overlapped to each other and respective sides other than the bottom edge side 2 e are welded. In the present embodiment 1, the sheet member for forming the bag body 2 is a resin net, but a non-woven fabric or a net of an organic degradable fiber can be used other than the resin net.

Here, a method for manufacturing the tea bag according to the embodiment 1 of the present invention will be described with reference to FIG. 4, In the present embodiment 1, a method for manufacturing the tea bag including the bag body 2 shown in FIG. 2 will be described.

As shown in FIG. 4(A), first, a sheet member is prepared to obtain a number of first lateral surfaces S11 in rows and columns. Further, although not shown, a broad sheet member to be second lateral surfaces S12 is prepared. In the present embodiment 1, to manufacture a number of the bag bodies 2 from the sheet member, lateral sides 2 f of a lower portion formed in a rectangular shape are commonly used by the adjacent bag bodies 2.

Next, tea leaves 3 of about 2 g to about 5 g are placed at a position corresponding to the storage part 2 a of the bag body 2 on at least one of the first lateral surface S11 side and the second lateral surface S12 side. In FIG. 4(A), the tea leaves 3 are placed on the Sheet member to he the first: lateral surfaces S11 side.

Next, as shown in FIG. 4(B), the sheet member to be the first lateral surface S11 on which the tea leaves 3 are placed is overlapped with the sheet member to be the second lateral surface S12. A heated mold is pressed against edges of all the sides including oblique sides 2 g of the narrow width portion 2 b and the bottom edge side 2 e as adhesion lines to be positions to adhere the sheet members so as to weld the edges by heat.

Then, the respective bag bodies 2 are cut out to be separated by a mold for cutting the respective sides at once and extra portions S3 sandwiched by the adjacent bag bodies 2 are removed so as to obtain the tea bag 1 shown in FIG. 1.

As described above, in the bag body 2, since the bag body 2 is closed by adhering all the sides including the oblique sides 2 g of the narrow width portion 2 b a planar adhesion can be achieved. Accordingly, the first lateral surface S11 and the second lateral surface S12 can be easily adhered to each other to close the bag body 2. According to the method for manufacturing the tea bag according to the present embodiment 1, after the respective sides of the bag bodies 2 are adhered to each other at once, the bag bodies 2 can be cut out to be separated to each other at once. Accordingly, a mass production in a short term can be achieved.

Next, a usage state of the tea bag according to the embodiment 1 of the present invention will be described with reference to FIG. 5.

As shown in FIG. 5(A), first, the tea, bag 1 is put into a plastic bottle B containing water therein or the tea bag 1 is put into an empty plastic bottle B. When the tea bag is put into the empty plastic bottle, the bottom edge side 2 e side of the tea bag 1 is put into the plastic bottle B first, and water is poured into the plastic bottle B. Then, the plastic bottle B is closed by a lid and shaken enough. Since the height H (see FIG. 1) of the tea bag 1 is greater than the diameter of the plastic bottle B, the tea bag 1 is not inverted even if the plastic bottle B is shaken. Accordingly, the top head portion 2 c is maintained in a state where it faces upward.

As the tea bag 1 is immersed in the water in the plastic bottle B, the tea leaves 3 absorb the water and spread over a whole interior of the bag body 2, but many of which stay at the lower portion 22 due to weights thereof. Accordingly, the bag body 2 that was planar in a dry state is thickened to be in substantially a thick truncated triangular shape as a whole (see FIG. 5(A)).

In the tea bag 1, since the upper portion 21 is formed in a trapezoidal shape and the lower portion 22 is formed in a rectangular shape, area of the bag body 2 is greater than a triangular tea bag with the bottom edge side 2 e and the height H. Accordingly, since a width in which the tea leaves 3 move in the hag body 2 can be broadly secured and the area of the bag body 2 through which the water stirred by shaking the plastic bottle B passes is wide, the tea essence can be efficiently brewed from the tea leaves 3 (see FIG. 1).

Upon brewing, since the top head portion 2 c of the bag body 2 is truncated, a connecting part between the top edge side 2 d of the top head portion 2 c and the oblique side 2 g of the narrow width portion 2 b is reinforced. Accordingly, since the distal end of the bag body 2 can be rigidly formed, the distal end of the bag body 2 can be prevented from being bent to be hard to exit the plastic bottle.

As shown in FIG. 5(B), when an opening B1 of the plastic bottle B is oriented downward after drinking out the beverage, the tea bag 1 at the bottom of the plastic bottle B moves toward the opening B1 so that the top head portion 2 c protrudes through the opening B1. As the top head portion 2 c is pinched to he pulled out, the tea bag 1 moves sliding along the inner peripheral surface of the opening B1 so that the shape of the tea bag 1 transitions from the thick truncated home base to a truncated cone similar to the distal tip of the pencil to be smoothly taken out of the opening B1. As described above, the tea bag 1 can be easily taken out of the plastic bottle B.

Embodiment 2

With reference to FIG. 6, a tea bag according to an embodiment 2 of the present invention will be described. In FIG. 6, the same reference signs are assigned to configurations the same as those of FIG. 1 and the description thereof is omitted.

As shown in FIG. 6, in a manner similar to that of the embodiment 1, a tea hag 10 is configured such that the tea leaves 3 are stored in a bag body 20 formed of a sheet member with water permeability. In the bag body 20, the narrow width portion 2 b tapered from the bottom edge side 2 e toward the distal end of the narrow width portion 2 b is formed and the top head portion 2 c is truncated so that the triangular shape is deformed to he trapezoidal.

As shown in FIG. 7, when manufacturing the tea bag 10, two sheet members are prepared to obtain a number of the bag bodies 20 in rows and columns formed from a first lateral surface S21 and a second lateral surface S22, the tea leaves 3 of about 2 g to about 5 g are placed on one of the sheet members, and the other one of the sheet members is overlapped with the corresponding sheet member (FIG. 7) shows a state where the sheet member to be the first lateral surface S21 is overlapped with the sheet member to be the second lateral surface S22). In the bag body 20, the oblique sides 2 g of the narrow width portion 2 b are commonly used by the adjacent bag bodies and the distal end portions are arranged to face with each other alternately.

Next, profiles of the bag bodies 20 are adhered to each other by heat-welding as adhesion lines to be positions to adhere the sheet members. Then, the respective sides as the adhesion lines (profiles) are cut out to be separated by the mold for cutting the sides at once to form the bag bodies 20.

In the bag body 20, in a manner similar to that of the embodiment 1, since the bag body 20 is closed by adhering all the sides including the oblique sides 2 g of the narrow width portion 2 b, a planar adhesion can be achieved. Accordingly, the first lateral surface S21 and the second lateral surface S22 can be easily adhered to each other to close the bag body 2.

Further, the bag body 20 is formed in the truncated triangular shape to be trapezoidal, a number of bag bodies 20 can be formed without wasting extra portions of the sheet members. Accordingly, the sheet members can be efficiently used with zero waste.

Another Method for Manufacturing the Tea Bag According to the Embodiment 2

The tea bag 10 according to the embodiment 2 can be manufactured by another method. Here, another method for manufacturing the tea bag according to the present embodiment 2 will be described with reference to FIG. 8.

First, a preparation is performed such that an elongated sheet member 4 with a width as twice as the height H (see FIG. 6) is doubled up to weld side edges 41 along a longitudinal direction and bottom edge sides 42 to be a bottom are welded to each other. The bottom edge sides 42 are formed corresponding to a position to be one of the oblique sides 2 g of the narrow width portion 2 b shown in FIG. 6. Then, as shown in FIG. 8(A), a nozzle N of a tea injecting device is inserted into the doubled up sheet member 4 from a top end to be the other oblique side 2 g in an open state.

Next, a predetermined amount (for example, about 2 g to 5 g) of the tea leaves is injected from the nozzle N of the tea injecting device. By doing so, since the bottom edge side 42 (the one of the oblique sides 2 g) of the sheet member 4 is welded, the tea leaves 3 enters the sheet member 4 from the other oblique side 2 g side to stay at a welding portion of the bottom edge side 42 as a bottom.

As shown in FIG. 8(C), as the tea leaves 3 are injected, a position corresponding to the other oblique side 2 g of the narrow width portion 2 b is welded. With this welding process, the bag body 2 of the first tea bag 10 is closed and one of the oblique sides 2 g of the narrow width portion 2 b of the second bag body 2 is formed to be a bottom of the second bag body 2.

Next, as shown in FIG. 8(D), as the tea leaves 3 are injected from the nozzle N of the tea injecting device, the tea leaves 3 stay at the second bag body 2 with the other oblique side 2 g as the bottom.

Then, as shown in FIG. 8(E), a position of the other oblique side 2 g of the first bag body 2 is cut to separate the first closed bag body 2 so as to obtain the first tea hag 10. Further, as shown in FIG. 8(F), a position to be the other oblique side 2 g of the second bag body 2 is welded and cut so as to obtain the second tea bag 10 and one of oblique sides of the narrow width portion 2 b to be a bottom of the next bag body 2 is formed.

As described above, steps of FIGS. 8(A) to 8(F) are sequentially repeated to use the sheet member 4 without waste so as to efficiently manufacture the tea bag 10.

When drinking the tea beverage using the tea bag 10, tea essence can be extracted according to the following method for brewing the tea essence.

-   (1) Corner portions of both ends of the bottom edge side 2 e are     folded to put the bottom edge side 2 e side into the plastic bottle     B first (see FIG. 9(A)), -   (2) If water is in the plastic bottle B in advance, a lid of the     plastic bottle B is closed after the tea bag 10 is put into the     plastic bottle B. If the plastic bottle B is empty, the tea bag 10     is put into the plastic bottle B after the water is poured into the     plastic bottle B. Then, the lid of the plastic bottle B is closed.     Alternatively, the water may be poured into the plastic bottle B     after the tea bag 10 is put into the plastic bottle B, and then the     lid of the plastic bottle B may be closed (see FIG. 9(B)). -   (3) In a state where the plastic bottle B is inverted, the plastic     bottle B is rotated as if a circle is drawn to stir the water in the     plastic bottle B by putting the water in the plastic bottle B in a     spiral state. As the water in the inverted plastic bottle B is in     the spiral state, the tea bag 10 put into the plastic bottle B stays     at the trunk portion of the plastic bottle B while being jostled by     the water in the spiral state without sinking down toward the     opening side. Accordingly, the tea essence can be efficiently brewed     from the tea leaves 3 (see FIG. 9(C)). -   (4) As the tea essence is brewed from the tea leaves 3, the rotation     is stopped.

By brewing the tea essence from the tea leaves 3 to allow the tea essence to exude to the water in the plastic bottle B as described above, the lid can be opened to drink the tea beverage.

For example, in the tea bag 1 (see FIG. 1) according to the embodiment 1, since the upper portion 21 to be the narrow width portion 2 b is formed on the rectangular lower portion 22, the weights of the tea leaves 3 positioned at the narrow width portion 2 b upon drinking out the tea beverage load upon the lateral sides 2 f of the lower portion 22. Accordingly, the bag body 2 is folded at a border between the upper portion 21 and the lower portion 22 to fall down so that the height H greater than the diameter of the trunk portion of the plastic bottle is shortened by a length of the lateral sides 2 f. Therefore, there is a risk in that the bag body 2 may he vertically inverted.

In the tea bag 10 according to the present embodiment 2, since the narrow width portion 2 b tapered from the bottom edge side 2 e toward a distal direction is formed, the weights of the tea leaves 3 positioned at the narrow width portion 2 b upon drinking out the tea beverage load directly upon the bottom edge side 2 e. Accordingly, although the bag body 2 leans over an inner lateral surface of the trunk portion in the plastic bottle, the bag body can be stably maintained such that it stands on a bottom surface in the plastic bottle with the bottom edge side 2 e facing downward. Since the bag body 2 can be stably maintained in such a state, when the plastic bottle is inverted, the distal end (the top head portion 2 c) of the bag body 2 begins sliding along the lateral surface in the trunk portion in the plastic bottle first so as to ensure that the top head portion 2 c of the bag body 2 can be out of the plastic bottle through the opening.

As described above, in the present embodiments 1 and 2, a heated mold is pressed against the sheet member to be welded, but ultrasonic waves may be used for welding. Further, an adhesive may be used for adhesion. It is desirable, however, that the adhesion may be performed by heat or ultrasonic welding since it is ensured that the adhesion can be performed in the short term, and there is no risk in that constituents of the adhesive seep.

It is desirable that the tea bags 1, 10 according to the present embodiments 1 and 2 are put into a plastic bottle of 500 ml to be used, but they may be put into a plastic bottle sized to have an internal capacity greater than 500 ml to be used. In this case, it is desirable that the top edge sides 2 d of the tea bags 1, 10 is sized to be smaller than the diameter of the opening, and it is desirable that the height H is sized to be greater than the diameter of the trunk portion of the plastic bottle.

INDUSTRIAL APPLICABILITY

According to the tea bag and the method for manufacturing the tea bag of the present invention, tea beverage can be made at a low cost and plastic bottles can be recycled. Accordingly, they are suitable for brewing tea beverage such as green tea, black tea, oolong tea, and Japanese roasted tea. 

1-4. (canceled)
 5. A tea bag comprising: tea extracts; and a bag body storing said tea extracts therein, said tea bag being to be put into a plastic bottle to brew tea essence from said tea extracts, wherein said bag body includes a first lateral surface and a second lateral surface both of which are formed of a sheet having water permeability, both of said first and second lateral surfaces have at least a tapered portion having a width narrowing toward a distal end thereof, and said first and second lateral surfaces are adhered to each other to form said bag body along at least oblique side edges of said tapered portions.
 6. The tea bag as set forth in claim 5, wherein said bag body includes a rectangular lower portion and a trapezoidal upper portion formed on said lower portion.
 7. The tea bag as set forth in claim 5, wherein said bag body is trapezoidal.
 8. The tea bag as set forth in claim 5, wherein said bag body has an upper edge having a length equal to a diameter of an opening of said plastic bottle.
 9. The tea bag as set forth in claim 5, wherein said bag body has a height greater than a diameter of a trunk portion of said plastic bottle.
 10. A method for manufacturing a tea bag to be put into a plastic bottle to brew tea essence from tea extracts, said tea bag including tea extracts, and a bag body storing said tea extracts therein, said bag body including a rectangular lower portion and a trapezoidal upper portion formed on said lower portion, said method comprising: putting said tea extracts at each of designated locations on a first sheet having water-permeability, said designated locations corresponding to locations at which said tea bag is to be formed; overlapping a second sheet over said first sheet, said second sheet having water-permeability; setting an adhesion line such that two bag bodies located adjacent to each other have a common side edge of said lower portions thereof, and adhering said first and second sheets to each other along said adhesion line; and cutting said first and second sheets along said adhesion line to separate said bad bodies into individual bag body.
 11. A method for manufacturing a tea bag to be put into a plastic bottle to brew tea essence from tea extracts, said tea bag including tea extracts, and a bag body storing said tea extracts therein, said bag body including at least a tapered portion having a width narrowing toward a distal end thereof, said method comprising: a first step of overlapping two sheets one on another, said two sheets having water-permeability; a second step of setting an adhesion line such that two bag bodies located adjacent to each other have a common oblique edge of said tapered portion, and that said two bag bodies alternately face each other at distal ends thereof; a third step of putting said tea extracts between said two sheets in an area at which said bag body is to be formed; a fourth step of adhering said two sheets to each other along said adhesion line; and a fifth step of cutting said two sheets along said adhesion line.
 12. The method as set forth in claim 11, wherein a single sheet having a width twice greater than a height of said bag body is prepared in said first step in place of said two sheets, said single sheet being folded into two portions, and a side edge of said two portions extending in a length-wise direction being adhered.
 13. The method as set forth in claim 11, wherein said fourth step includes: adhering said two sheets along one of oblique edges of said tapered portion; and adhering said two sheets along the other of said oblique edges to form said bag body.
 14. The method as set forth in claim 13, wherein said third step includes dispensing said tea extracts through said other of said oblique edges of said tapered portion, said other of said oblique edges being open.
 15. The method as set forth in claim 11, wherein said bag body is trapezoidal. 